http://www.loc.gov/- A General works
- B Philosophy; psychology; religion
- C Auxiliary sciences of history
- D History: General and Old World
- E-F History: America
- G Geography; anthropology; recreation
- H Social sciences: LocHf (Compute Science), ...
- J Political science
- K Law
- L Education
- M Music and books on music
- N Fine arts
- P Languages and literature
- Q Science
- R Medicine
- S Agriculture
- T Technology: LocTr (Photography), ...
- U Military science
- V Naval science
- Z Library science
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